How to Rename a column of a table using alter table and
How to modify a column of a table using alter table
Modify means
How to change datatype of a column and how to change size/width of a column
Web Article link http://bit.ly/sql-tutorial23
Tutorial 21 How to rename a table : http://bit.ly/sql-tutorial-21
Tutorial 22 How to add/ delete column: http://bit.ly/sql-tutorial-22
YouTube Video on How to create database
http://bit.ly/create-database-using-DBCA
Tool used in this tutorial is SQL Developer.
This tutorial series is part of SQL expert exam certification training. if you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training.
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In this video ,we will generate the script that will return us all the table names with column names and data type of those columns. We often need this information. Let's say we are going to prepare mapping document for load the data from Source Database to Destination database. We can get the list of all tables with column names and data types from Source Database and Destination Database and then paste in Excel and map the required input columns to output columns for ETL Process.
Blog link with scripts used in video
http://sqlage.blogspot.com/2015/02/get-all-tables-with-column-names-and.html

in this video I will tell you how can get the table name and column and database name from the unknown database.
As database connection is written in the server language so we need to run some code before we get to that stage of getting the table name, column name and database from the website
To run our sql injection we are going to use, UNION query
Step – 1 – In the step one we will try to get the number of column, to do that I will type the user which exist in the database
Step – 2 – After knowing the number of column, we will try to get the table name and column name from the database,
to do that I will use union query, and I will give below value in the form.
Step – 3 – After knowing the table name and database name, we will try to get the table name, in the userprivateinfo table,
to do that again I will use union query, and I will give below value in the form.
Step – 3 – After knowing the table name and database name and column name, we will run one example
to do that again I will use union query, and I will give below value in the form.
Note – Although I keep on using Tom, as starting value, for every step, but you can use any value, as it does not matter, weather that value exist in the database or not.
For the full source code – click on this link

In the previous video we talked about adding constraints at the column-level. We made it nice and simple by only requiring a few keywords, but the problem we were having is that we could not assign a name to the constraint, which many people like to do so we can reference easily if we need to at a later time. To do this, it requires a little bit more typing, but it will give us extra flexibility and many consider it to be the higher quality approach to adding constraints.
Let's go though a simple example. Let's say we have a users table with a user_id column that we want to make a primary key. We will create the table like this:
CREATE TABLE(
user_ id NUMBER PRIMARY KEY
)
Instead of adding the PRIMARY KEY keywords after the data type, we add:
CONSTRAINT user_pk PRIMARY KEY
Now, we have assigned the name user_pk to this constraint. You can do the same with other constraints, such as UNIQUE. The syntax would be CONSTRAINT username_un UNIQUE.
The other way to create constraints requires to put all of our constraints at the bottom of our table creation rather than inline with the column. This type of constraint is known as a table-level constraints. To make a column a primary key using table-level constraints, we add it to the CREATE TABLE command as if it is another row and use the CONSTRAINT keyword to tell Oracle that what is coming is a constraint, not a column in our table.
CREATE TABLE users(
user_id NUMBER,
username VARCHAR2(50 CHAR),
CONSTRAINT username_un UNIQUE (username),
CONSTRAINT users_pk PRIMARY KEY (user_id)
)
The primary differences here is that you have to put the column you are talking about in parenthesis after the PRIMARY KEY keyword. That's because it's at the end of the table and you need a way to tell it what column you are talking about.
The option of putting it at the end of the table has the added benefit in this situation because if we needed to have a primary key that is the combination of multiple columns, we can do that by just adding the other column in the PRIMARY KEY parenthesis right after a comma.
In summary, there are three ways to make constraints. The first is at the column level, unnamed. The second is at the column level, named. The third is at the table level, also named.
In the next video we are going to create a named constraint in Oracle SQL Developer, so stay tuned and be sure to subscribe!
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Question: How to get column names from a specific table in SQL Server?
Answer: This is a very popular question and there are multiple ways to get column names of a specific table in SQL Server. Let us see various methods. You can choose the method which you prefer to use for your solutions.
Click here to get related scripts discussed in this blog post. https://blog.sqlauthority.com/2017/06/29/sql-server-get-column-names-specific-table/

http://bit.ly/oracle-sql-course | Get the complete course today.
Learn Oracle SQL : Table And Column Aliases : In this video I explain what aliases are and why you would want to uses aliases for tables and columns, and show you the different ways you can use the define them.
This is an excerpt of the course " Oracle SQL From Scratch " which you can get at a discounted price here: http://bit.ly/oracle-sql-course
You can find additional Oracle SQL related articles and educational content in my blog here: http://standout-dev.com/

COLUMN ALIASES are used to make column headings in your result set easier to read.
TABLE ALIASES are used to shorten your SQL to make it easier to read or when you are performing a self join (ie: listing the same table more than once in the FROM clause).
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In this turial, I will show you how to rename column name by using sql query, how to rename column name by query in mysql, how to use query window in mysql, How To rename column in Table by Using Sql Query, How To rename column name By Using SQL Query, how to rename column name in sql, how to rename column name in database table,How To rename column name In mysql By Using Select Query - MySql Database Bangla Tutorial. I hope you enjoy this tutorial. Please subscribe my channel.
Wish You Success,
Shoaib Hossain
(softall503s - soft all)

This command is very useful for beginners. Codesnipr describes how to
change your column name in MySQL. A user can get benefit to see the video to know more about this command.
http://www.codesnipr.com/snippet/178/Change-Column-Name-in-SQL

We model a MySQL database using a diagram in MySQL workbench. We then forward engineer the diagram to create MySQL database on the server. MySQL workbench is a powerful tool for modeling and creating databases and we take advantage of it's relationship tool to create many to many relationship between our main movie table, and stars, directors and genres tables. I don't go into too much detail on how the relationships work in this video on purpose, I wanted to make a general overview of how MySQL workbench can be used to quickly created the model of a database with relationships between tables.
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From the video:
Let's go ahead and create the database model which will hold all the data now using MySQL Workbench (a free program that you can download here). When you first open the Workbench, create a new connection by clicking on the + icon.
I'm going to name my connection localhost and and put "root" for the username. Then press press the storage vault button and enter your password. You can then click on "test the connection" and you should get the message: "successfully made the MySQL connection." At this point, click OK, and then double click on this newly created connection to connect to your MySQL database server.
Now go to File---New Model and double click on Add Diagram. This is the part of the program where we're going to be designing our database model. You will see a toolbar on the left side along with all the tools available which we can use to model the database. Go ahead and double-click on the New Table icon which will place a new table in the diagram. When the table shows up on the diagram, double-click on it, the new box will show up at the bottom of the screen where we can rename our table as well as specify all the column names and their appropriate data types.
Name this table that we have just created "movies", and then for the very first column, enter "id" which will be the unique identifier for this table. This id will also act as primary key which is going to auto increment so make sure the primary key and auto-increment check boxes are both checked as well as not null (NN). Now let's go ahead and enter the rest of the column names.
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Learn to filter a table's column data in output based on another table's column data.
How is this done?
-- Using the LIKE operator when we have to deal with strings (char/varchar/varchar2).
Here's the query:
-----------------------------------------------------------------------------------------------------------
select emp1.empid, empname, dept1.deptid, dept1.city
from dept1 inner join emp1
on(emp1.deptid = dept1.deptid)
where dept1.city in (select emp1.city from emp1)
or dept1.city like (emp1.city || '%');
-----------------------------------------------------------------------------------------------------------
Here the tables are joined using the inner join on the department IDs as they are not related by the foreign key constraint.
The LIKE Operator and the wildcard character % helps to filter the string data here.
The first section of the where clause is to filter the exact names of cities. Removing this will remove 'california' from the result.
This can be very useful to filter candidate names or locations or any string data which is present in two tables.
Hop on to learn more!
Subscribe to my channel to learn new Oracle/SQL tips and tricks to obtain a particular output.
Use the Oracle Express Edition for quick learning!
Check out my other videos:
--------------------------------------------------
Clone an Oracle table using SQL: https://youtu.be/8MICKuNoT1w
Add Primary Key to Existing Table: https://youtu.be/DgGoedEBLoU
Create an Application Workspace: https://youtu.be/Tl9hddgUSdI
Download the latest Oracle Express Edition release here:
http://www.oracle.com/technetwork/database/database-technologies/express-edition/downloads/index.html
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Use inner joins with multiple tables to create reports. Uses aliases, and the SUM aggregate function to demonstrate the flexibility of the join statement.
Get the SQL script to create the database and run the exercies in the video here: https://www.qewbi.com/sql/scripts/qewbijoins.zip

This Video Tutorial Will Describe how to change the name of a table or how to delete the existing table. This command will also work on other versions of database like Oracle 11g Database, Oracle 10g Database, Oracle 9i Database, Oracle 8i Database, Oracle 8 Database and so on.
RENAME command is used to change the name of the table to new name. DROP command is used to delete the existing table permanently along with all its data.
Full Syntax will be given in this video tutorial about how to use the RENAME & DROP command.
Along with the live example to RENAME AND DROP table command.
All the keywords, format, mandatory clauses etc are described in this video.